Dyeing and printing cellulose esters



mama 0 12, 1926.

UNITED STATES "PATENT OFFICE.

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Io Drawing. Application fled Iaroh' 1826, Serial Io. 92,345, and in Germany Iarcht, 1925. l y

. I have found that water-soluble sulfamic acids derived from colored amino compounds which are not dyestuffs in a usual sense, especiall from amino-anthraqiiinones, are ex cellent y suitable for. dyeing and prmtin cellulose esters and fabrics made thereo These sulfamic acids can be used as such or the state of salts and may contain one or several NH SO,H residues with or without further substituents in their molecules.

3 The dyeing process may be carried out in the usual manner without any preliminary treatment of the cellulose ester as for example a partial saponificationthereof beingnecessary. In many cases the dyeings so ob tained may be subjected to an after-treatment with diazo compounds or they may be di-azotized and coupled with a suitable component, by which aftertreatments valuable new shades are obtained. The printing may also be carried out in the usual manner and bright beautiful shades are obtained thereby.

The following examples will further ill 11s. trate the manner of carrying the invention out in practice, to which examples, however, the invention is not limited. The parts are 'by weight.

Example 1.

ing to this solution 10 per cent of Glaubers salt and 4 per cent of sulfuric acid- (all quantities are calculated on the weight of thecel lulose acetate). The tem erature is slowly raised to 70 degrees to 80 egrees centigrade.

A beautiful reddish violet dyeing is obtained. Instead of sulfuric acid a greater quantity of formic acidmay be employed,

tained.

whereby somewhat lighter shades are ob-.

) Example 2. Cellulose acetate silk is dyed beautiful reddish blue sh'ades at about 5 degrees centigrade from adye-bath pre ared 'b 'dissolv ing 3 per cent of the so ium sat of 1.5- disulfamic acid-4.S-dihydroxy-anthraquinone (of about 54 per cent purity) in water and adding 10 per cent of sodium bisulfate in one or several portions.

'Ezvample 3.

parts "of the .sulfamic acid sodium salt-- by means of 900 parts of a thickenin mixture. Cellulose acetate silk is printe with this paste, dried, steamed and rinsed; The silk is colored bright bluish red shades.

What I claim is 1. The process of dyeing and printing cellulose-esters which consists in applying to the oods a water-soluble sulfamic acid derive from a coloured amino compound which is not a dycstufi of itself.

2. The process of dyeing and printing cellglose esters which consists in applying to t e rive from an amino-anthraquinone.

3. The process of dyeing and printing cellulose esters which consists in applying to the goods a water-soluble sulfamic acid derived from a coloured amino compound which is not a dyestufi, and diazotizing the dyeing and combining it with a suitable dyestufi' component.

4. The process of dyeing and printing cellulose esters which consists in applying to the goods awater-soluble sulfamic acid derived from an amino anthraquinone which is not a dyestufi, di'azotizing the compound oods a water-soluble sulfamic acid'deapplied to the goods and coupling it wlth an azo dystuff component.-

In testimony whereof I have hereunto set myhand.

RICHARD 'METZGER. 

